They should be plumb and hold the door at a consistent distance from the side stops assuming the stops themselves are plumb.
Garage door is not closing evenly.
Put a ladder under the door to make sure it won t close accidentally while you re working on it.
There are several things that can cause this.
When the settings are too high the door senses the floor as an obstruction and immediately opens again after closing.
Repairing your garage door springs can be a dangerous job due to the weight of the door.
Do not attempt to do this yourself.
When this happens you need to shift it back into position.
Some times you need to adjust the garage door.
The good news is this can be easily adjusted with a screwdriver and a few.
If the garage door stops look okay but the door is out of plumb not perfectly vertical when closed check the vertical sections of the roller tracks on each side of the door.
The most likely cause of that is that the springs that help lift the door and prevent it from closing to fast need to be adjusted or replaced.
Keep the door open a few feet off the ground as this takes the pressure off the door springs.
The extension springs are evenly matched and installed to keep the garage door properly aligned so that it runs smoothly throughout the entire length of the track and closes evenly.
Place a stepladder beneath the box portion of the garage door opener.
If your door has a gap on one side or the other when it s closed the problem is most likely due to a break or other issue with one of the extension springs.
Have a helper steady the ladder.
This can happen when the door has shifted to one side causing it to appear uneven.
If you suspect you need to adjust one or both of the extension.
If the door simply stops short of the floor the likely culprit is the down limit switch.